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Class Information
Number: 398/132
Name: Optical communications > Photophone
Description: Subject matter wherein an audio signal, as an information signal, is directly modulated onto a light beam.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7391976 |
Optical acoustoelectric transducer |
Jun. 24, 2008 |
| 7277642 |
Fine displacement detection device by sound or the like |
Oct. 2, 2007 |
| 7078726 |
Sealing of electronic device using absorbing layer for glue line |
Jul. 18, 2006 |
| 6952530 |
Integrated glass ceramic systems |
Oct. 4, 2005 |
| 6721429 |
Electro-magnetic microphone |
Apr. 13, 2004 |
| 6630687 |
Active matrix display device having wiring layers which are connected over multiple contact parts |
Oct. 7, 2003 |
| 6570689 |
Portable telephone and automobile system |
May. 27, 2003 |
| 6525857 |
Method and apparatus for interleaved optical single sideband modulation |
Feb. 25, 2003 |
| 6483619 |
Optical-interference microphone |
Nov. 19, 2002 |
| 6459798 |
Sound-collecting device |
Oct. 1, 2002 |
| 6445369 |
Light emitting diode dot matrix display system with audio output |
Sep. 3, 2002 |
| 6427014 |
Microphone |
Jul. 30, 2002 |
| 5995260 |
Sound transducer and method having light detector for detecting displacement of transducer diaphragm |
Nov. 30, 1999 |
| 5621806 |
Apparatus and methods for determining the relative displacement of an object |
Apr. 15, 1997 |
| 4689827 |
Photofluidic audio receiver |
Aug. 25, 1987 |
| 4566135 |
Pressure transducer |
Jan. 21, 1986 |
| 4503564 |
Opto-acoustic transducer for a telephone receiver |
Mar. 5, 1985 |
| 4422182 |
Digital microphone |
Dec. 20, 1983 |
| 4412105 |
Laser microphone |
Oct. 25, 1983 |
| 4224482 |
Mobile microphone-transmitter assembly |
Sep. 23, 1980 |
| 4105915 |
Deflection-type modulator of laser beam for communications |
Aug. 8, 1978 |
| 4028977 |
Optoelectronic sound amplifier system for musical instruments |
Jun. 14, 1977 |
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